I did it once using a Swiss knife and a flat head screw driver and I am still using the cable. It is not the best but it worked for me. The tool was so expensive up here so I made the swiss knife work.

Try to get the connector for about $0.40-50 each. Run the cable through the hole and orient the wires into the connector. Once you are sure about the wires are correct pound the little slot to hold the wire in place with a screwdriver. Use the knife's edge or a thin screwdriver to press the metal contacts to the wires. If that didn't work then you can buy another cable.